EP0213846A3 - Waveform generation method - Google Patents

Waveform generation method Download PDF

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Publication number
EP0213846A3
EP0213846A3 EP86306273A EP86306273A EP0213846A3 EP 0213846 A3 EP0213846 A3 EP 0213846A3 EP 86306273 A EP86306273 A EP 86306273A EP 86306273 A EP86306273 A EP 86306273A EP 0213846 A3 EP0213846 A3 EP 0213846A3
Authority
EP
European Patent Office
Prior art keywords
waveform
tone
frequency
value
dtmf
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86306273A
Other languages
German (de)
French (fr)
Other versions
EP0213846A2 (en
Inventor
Arthur Lange
P. Venkitakrishnan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Advanced Micro Devices Inc
Original Assignee
Advanced Micro Devices Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Advanced Micro Devices Inc filed Critical Advanced Micro Devices Inc
Publication of EP0213846A2 publication Critical patent/EP0213846A2/en
Publication of EP0213846A3 publication Critical patent/EP0213846A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form

Abstract

A method for the generation of precise single- and dual-tone multiple-frequency signals using only digital signal processing techniques is disclosed. The frequency, amplitude and cadence of the tone(s) generated are programmable via a microprocessor. The tones generated are suitable for the dual-tone multiple-frequency (DTMF) used in communication networks as well as for tone message and tone ringer functions. The principle of operation is that a triangular wave is produced (820, 826) by the repetitive addition of a user-supplied "delta" value to an accumulator until an overflow condition occurs, and then the delta value is repetitively subtracted from the accumulator until an underflow condition occurs. Next, a trapezoidal wave is produced by multiplying (822, 828) the triangular waveform by 1.5 and truncating the resulting waveform at selectable positive and negative levels. The desired amplitude is then established by multiplication by a selectable attenuation (824, 830) value. A DTMF waveform is obtained by generating two waveforms as just described and then summing (832) the resulting waveforms, producing a waveform of a frequency with less than 1% deviation. An exemplary embodiment illustrates the waveform generation method of the present invention in the audio processor section of a digital subscriber controller.
EP86306273A 1985-08-30 1986-08-14 Waveform generation method Withdrawn EP0213846A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77138285A 1985-08-30 1985-08-30
US771382 1985-08-30

Publications (2)

Publication Number Publication Date
EP0213846A2 EP0213846A2 (en) 1987-03-11
EP0213846A3 true EP0213846A3 (en) 1988-12-07

Family

ID=25091626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86306273A Withdrawn EP0213846A3 (en) 1985-08-30 1986-08-14 Waveform generation method

Country Status (2)

Country Link
EP (1) EP0213846A3 (en)
JP (1) JPS6253051A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5208852A (en) * 1988-09-27 1993-05-04 Seiko Epson Corporation Sound generation circuit
ATE233969T1 (en) * 1999-09-14 2003-03-15 Seiko Epson Corp METHOD AND DEVICE FOR GENERATING THE DRIVING VOLTAGE PROFILE FOR AN INK JET PRINT HEAD
EP2468782A1 (en) 2010-12-27 2012-06-27 Cytec Surface Specialties, S.A. Radiation curable compositions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328554A (en) * 1980-07-03 1982-05-04 The United States Of America As Represented By The Secretary Of The Navy Programmable frequency synthesizer (PFS)
EP0168969A1 (en) * 1984-06-15 1986-01-22 Advanced Micro Devices, Inc. A method and digital circuit for generating an approximate sinusoidal waveform

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328554A (en) * 1980-07-03 1982-05-04 The United States Of America As Represented By The Secretary Of The Navy Programmable frequency synthesizer (PFS)
EP0168969A1 (en) * 1984-06-15 1986-01-22 Advanced Micro Devices, Inc. A method and digital circuit for generating an approximate sinusoidal waveform

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
EDN, vol. 24, no. 1, January 1979, pages 79,81; G.E. PRESCOTT: "MOSFETs convert triangles to sine waves" *
ELECTRONICS LETTERS, vol. 8, no. 21, 19th October 1972, pages 524-525; A.D. PROUDFOOT: "Simple multifrequency-tone detector" *
IEEE PROCEEDINGS OF THE INTERNATIONAL SWITCHING SYMPOSIUM, Montreal, 21st-25th September 1981, Session 13 B, paper 5, pages 1-5; G. KERDONCUFF et al.: "Multifrequency signalling unit employing digital techniques for signal transmission and reception" *
WIRELESS WORLD, vol. 85, no. 1528, December 1979, page 59; T. WILLIAMS: "Triangle-wave generator" *

Also Published As

Publication number Publication date
JPS6253051A (en) 1987-03-07
EP0213846A2 (en) 1987-03-11

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Inventor name: LANGE, ARTHUR

Inventor name: VENKITAKRISHNAN, P.